just playing around

3 files changed, 116 insertions, 92 deletions

diff --git a/sources/chip8.c b/sources/chip8.c
index 1c5f907..836b9ef 100644
--- a/sources/chip8.c
+++ b/sources/chip8.c
@@ -7,7 +7,7 @@
 
 
 #define C8_RESET_VECTOR     0x200
-#define C8_CYCLES_PER_FRAME 1000
+#define C8_CYCLES_PER_FRAME 20
 
 static const u8 fnt[] =
 {
@@ -36,6 +36,7 @@ typedef struct
     u8  sp;
 
     u16 i;
+    u16 prevkeys;
     u16 keys;
 
     u64 cycles;
@@ -137,8 +138,8 @@ void c8_dump_state(chip8* c8, bool stack)
         printf("V%x: %02X (%3d)\n", i+3, c8->V[i+3], c8->V[i+3]);
     }
 
-    printf("      I:%04X SP: %02X DT: %02X ST: %02X CYCLES: %llu\n",
-            c8->i, c8->sp, c8->dt, c8->st, c8->cycles);
+    printf("      I:%04X SP: %02X DT: %02X ST: %02X CYCLES: %llu, KEYS: %X\n",
+            c8->i, c8->sp, c8->dt, c8->st, c8->cycles, c8->keys);
 
     if(stack)
     {
diff --git a/sources/main.c b/sources/main.c
index e1dc077..4bc972c 100644
--- a/sources/main.c
+++ b/sources/main.c
@@ -351,12 +351,60 @@ void iui_draw(iui* ui)
 
 int main(int argc, char** argv)
 {
+    chip8 c8 = {0};
     xctx x11 = {0};
     iui   ui = {0};
-    bool run = true;
-    char txtbuf[256] = {0};
+    bool run = true, cycle = false;;
+
+    u64   sz = 0;
+    FILE*  f = NULL;
+    char buf[512] = {0};
+
+    srand(time(NULL));
+
+    if(argc > 1)
+    {
+        u64 got = 0;
+
+        f = fopen(argv[1], "r");
+        if(!f) return 1;
+
+        fseek(f, 0, SEEK_END);
+        sz = (u64)ftell(f);
+        rewind(f);
+
+        if(sz >= (sizeof(c8.RAM) - 512)) return 2;
+
+        got = fread(c8.RAM + C8_RESET_VECTOR, 1, sz, f);
+        if(got != sz) return 3;
+
+        fclose(f);
+    }
+    else
+    {
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x60;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x04;
+
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x61;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x03;
+
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x72;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x01;
+
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x80;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x14;
+
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x30;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x10;
+
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x12;
+        c8.RAM[C8_RESET_VECTOR + iota] = 0x04;
+
+        sz = iota;
+    }
 
     x11_init(800, 600, "xip-8", argc, argv, &x11);
+    c8_reset(&c8);
 
     while(run)
     {
@@ -385,6 +433,35 @@ int main(int argc, char** argv)
 
                     len = XLookupString(&ev.xkey, name, sizeof(name) - 1, &ks, NULL);
                     if(keyup && ks == XK_Escape) run = false;
+
+                    if(!ui.kbdfocus)
+                    {
+                        u16 bits = 0;
+                        switch(name[0])
+                        {
+                            case 'x': bits = bit(0);  break;
+                            case '1': bits = bit(1);  break;
+                            case '2': bits = bit(2);  break;
+                            case '3': bits = bit(3);  break;
+                            case 'q': bits = bit(4);  break;
+                            case 'w': bits = bit(5);  break;
+                            case 'e': bits = bit(6);  break;
+                            case 'd': bits = bit(7);  break;
+                            case 's': bits = bit(8);  break;
+                            case 'a': bits = bit(9);  break;
+                            case 'z': bits = bit(10); break;
+                            case 'c': bits = bit(11); break;
+                            case '4': bits = bit(12); break;
+                            case 'r': bits = bit(13); break;
+                            case 'f': bits = bit(14); break;
+                            case 'v': bits = bit(15); break;
+                            default: break;
+                        }
+
+                        if(keyup) c8.keys &= ~bits;
+                        else      c8.keys |=  bits;
+                    }
+
                     if(!keyup && len == 1)
                     {
                         if(ui.kbdfocus && (isgraph(name[0]) || name[0] == ' '))
@@ -481,95 +558,32 @@ int main(int argc, char** argv)
         }
 
         iui_start(&ui, &x11);
-            if(iui_button(&ui, 25, 25, 100, 35, "Click ME!"))  report(DBG, "CLICK!\n");
-            if(iui_button(&ui, 150, 25, 100, 35, "NOT ME!!!")) report(DBG, "WHYYYYYY!\n");
-
-            iui_textbox(&ui, 25, 75, 225, 35, txtbuf, lengthof(txtbuf));
-            if(iui_button(&ui, 275, 75, 100, 35, "OK")) report(DBG, "textbox: '%s'!\n", txtbuf);
+            if(iui_button(&ui, 25, 25, 100, 35, "Cycle")) cycle = !cycle;
+            iui_textbox(&ui, 25, 75, 225, 35, buf, lengthof(buf));
         iui_end(&ui);
 
-        usleep(10000);
-    }
-
-    x11_cleanup(&x11);
-    return 0;
-}
-
-int main2(int argc, char** argv)
-{
-    u64   sz = 0;
-    FILE*  f = NULL;
-    chip8 c8 = {0};
-
-    srand(time(NULL));
-
-    c8_reset(&c8);
-
-    if(argc > 1)
-    {
-        u64 got = 0;
 
-        f = fopen(argv[1], "r");
-        if(!f) return 1;
-
-        fseek(f, 0, SEEK_END);
-        sz = (u64)ftell(f);
-        rewind(f);
-
-        if(sz >= (sizeof(c8.RAM) - 512)) return 2;
-
-        got = fread(c8.RAM + C8_RESET_VECTOR, 1, sz, f);
-        if(got != sz) return 3;
-
-        fclose(f);
-    }
-    else
-    {
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x60;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x04;
-
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x61;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x03;
-
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x72;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x01;
-
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x80;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x14;
-
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x30;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x10;
-
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x12;
-        c8.RAM[C8_RESET_VECTOR + iota] = 0x04;
-
-        sz = iota;
-    }
-
-    printf("Disasm:\n");
-    {
-        u64 i;
-        char buf[512] = {0};
-
-        for(i = 0; i < sz; i += 2)
+        if(cycle)
         {
-            u16 pc = C8_RESET_VECTOR + i;
-            c8_disasm(c8.RAM, pc, buf);
-            printf("%04X:   %s\n", pc, buf);
+            c8_disasm(c8.RAM, c8.pc, buf);
+            c8_exec(c8.RAM, c8.pc, &c8);
         }
-    }
 
-    printf("\nExec:\n");
-    while(c8.running)
-    {
-        char buf[512] = {0};
+        {
+            usize x, y, s = 4;
 
-        c8_disasm(c8.RAM, c8.pc, buf);
-        printf("%04X:   %s\n", c8.pc, buf);
+            XSetForeground(x11.disp, x11.gc, x11.cols.as.fg);
+            XSetBackground(x11.disp, x11.gc, x11.cols.as.bg);
 
-        c8_exec(c8.RAM, c8.pc, &c8);
-        c8_dump_state(&c8, false);
+            for(y = 0; y < 32; y++)
+                for(x = 0; x < 64; x++)
+                    if(c8.DISPLAY[y] & bit(x))
+                        XFillRectangle(x11.disp, x11.wnd, x11.gc, 25 + x*s, 128 + y*s, s, s);
+        }
+
+        usleep(10000);
     }
 
+    x11_cleanup(&x11);
     return 0;
 }
diff --git a/sources/meta/exec.c b/sources/meta/exec.c
index b5aaba4..4f34d1b 100644
--- a/sources/meta/exec.c
+++ b/sources/meta/exec.c
@@ -34,6 +34,7 @@ BEGIN \
         if(c8->st) c8->st--; \
     } \
     c8->pc += 2; \
+    c8->prevkeys = c8->keys; \
 END
 
 #define X_C8_ILL \
@@ -104,12 +105,12 @@ END
 
 #define X_C8_SKP \
 BEGIN \
-    if(c8->keys & c8->V[x]) c8->pc += 2; \
+    if(c8->keys & bit(c8->V[x])) c8->pc += 2; \
 END
 
 #define X_C8_SKNP \
 BEGIN \
-    if(!(c8->keys & c8->V[x])) c8->pc += 2; \
+    if(!(c8->keys & bit(c8->V[x]))) c8->pc += 2; \
 END
 
 #define X_C8_MVDT \
@@ -117,10 +118,19 @@ BEGIN \
     c8->V[x] = c8->dt; \
 END
 
-/* TODO: implement */
 #define X_C8_LDK \
 BEGIN \
-    if(!c8->keys) c8->pc -= 2; \
+    int i; \
+    if(c8->keys == c8->prevkeys) c8->pc -= 2; \
+    else \
+    { \
+        for(i = 7; i >= 0; i--) \
+            if(c8->keys & bit(i)) \
+            { \
+                c8->V[x] = i; \
+                break; \
+            } \
+    } \
 END
 
 #define X_C8_LDDT \
@@ -227,8 +237,7 @@ BEGIN \
     if(c8->V[x] != c8->V[y]) c8->pc += 2; \
 END
 
-
-/* TODO: actually implement */
+/* FIXME: correct wrapping, test */
 #define X_C8_DRW \
 BEGIN \
     u8 l; \
@@ -236,7 +245,7 @@ BEGIN \
     u8 cy = c8->V[y]; \
     \
     for(l = 0; l < n; l++) \
-        c8->DISPLAY[cy + l * cx] ^= c8->RAM[c8->i + l]; \
+        c8->DISPLAY[(cy + l) % 32] ^= ((u64)c8->RAM[c8->i + l]) << (64 - cx); \
 END
 
 c8_decode_generate(exec)